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[improve](docs)Improve type casting documentation clarity and example #1926

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@KassieZ @morrySnow PTAL

@vinlee19 vinlee19 changed the title [improve](docs)improve data types doc [improve](docs)Improve type casting documentation clarity and example Jan 23, 2025

## Syntax

```sql
SHOW TYPE_CAST [IN|FROM db]
SHOW TYPE_CAST [ IN | FROM <db>]
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Suggested change
SHOW TYPE_CAST [ IN | FROM <db>]
SHOW TYPE_CAST [ { IN | FROM } <db>]

Comment on lines +87 to +95
**************************** 1. row ******************** ******
Origin Type: TIMEV2
Cast Type: TIMEV2
**************************** 2. row ******************** ******
Origin Type: TIMEV2
Cast Type: TIMEV2
**************************** 3. row ******************** ******
Origin Type: TIMEV2
Cast Type: TIMEV2
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用表格形式的返回结果,不要用 \G 的

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